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More on Protection Relay

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Is there any dv/dt protection relay?
If yes, Where & why it is used?
Is any Web-site is having this write up on it?
Who are the manufacturers of this?
Pl let me know, I am very thankfull for you.
Regards,

CM
 
Are u talking about df/dt, by any chance ??
 
I think you want a time overvoltage relay.
Look up the General Electric type IFV
 
yes there lot of relays which have got dv / dt protection. i have come across Alstom, L & T, AVK SEGC dv /dt relays. as far as i know, these relays are used as islanding relay.
 
RArawal -
I would be interested to know which model Alstom relays provide the dv/dt function. I checked their website, also that of AVK SEG, and I wasn't able to find any reference to dv/dt function in a cursory check. BTW, who are L & T? I confess that I am not familiar with that name.
 
By dv/dt relay, could you be refering to a volts/hertz relay?
 
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